I did my own service for the first 30k. Just went for 60k Preventive Maintance oil and filters service (a little over $300) at Freightliner Oasis in Tolleson, AZ. They found an exhaust leak and a bad turbo plus coach ride height was out of spec.
I would not have found those problems at such an early stage and could have had serious problems down the road. Contrary to popular belief diesel engines are not bulletproof.
The warranty company inspected and approved repairs. Close to 5k. I haven't seen final bill. It is ready, but I won't pick it up till Monday.
Find a good Freightliner Oasis center. A good shop can save you money.
As a note Freightliner Tolleson also did the 45k PM oil and filters.